It is NOT a zinc or a cover, it is a solid brass nut. I have the same prop nut on my boat and have removed it a few times. There is nothing weird or complicated about it. Remove the center bolt which acts as a lock and unscrew the giant nut. The center lock bolt should have a locking "washer" on it, but since they're SS and have to be bent, they only last maybe 4-6 times. Fortunately, its easy to make a new one with a hacksaw and a piece of stainless.
See attached pictures.
Ken
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